Lichen planus (LP) is a chronic inflammatory mucocutaneous disease of unknown etiology. Pathogenesis of LP is not completely understood, but it's considered a T-cell-mediated autoimmune disease. Cold-inducible RNA binding protein (CIRP or CIRBP) is a member of the glycine-rich RNA-binding protein family, Recent studies proved that CIRP acts as a tumor promoter through its actions on different cellular proliferation levels, Recently, the role of the damage associated molecular proteins and cytokines was highlighted in the pathogenesis of many disorders including psoriasis, alopecia areata, vitiligo, rheumatoid arthritis, other autoimmune diseases as well as several types of cancer. The aim of this study is to compare serum and tissue levels of CIRP in patients with LP and healthy controls.